Fix failures to h2spec test and make h2spec test more resilient #6881
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Another solution to PR #6879
Adjusts a change in #6732 to ensure that the error frame is emitted.
Also adjusts the timeout for h2spec from the default of 2 seconds to 10. I was seeing failures in the concurrent stream overflow test (5.1.2) where sometimes it would succeed and sometimes timeout. This was with and without the changes in #6732.